If by “upgrade” you mean getting the latest model of what you currently have, the Connect has been replaced by the Sonos Port. The Boost is still the same. The Bridge is no longer necessary so you don’t need to replace it and can just remove it from your system.

So the only devices you would be “upgrading” are the two Connects. But if the Connects are Gen 2s, they are compatible with the S2 app and they don’t necessarily need to be “upgraded”.

Thank you!  Unfortunately my Connects are Gen1.